I just had skirting boards fitted at my place. I had an older tradesman fit them and he recommended scribing the internal joints but we had an issue because the bullnose on my new skirting boards was really small and almost impossible to scribe. After a lot of mucking around, he ended up butt-joining the internals instead of scribing. Not sure if that helps you!

Definitely recommend asking the guys and team over at Intrim Mouldings. They are based Western Sydney.

They are a great team and would be happy to help you.